Skip the auto shop - Our mechanics make house calls

Q: I have a problem with my truck vibrating.

asked by on

My truck started off with a slight vibration now it has increased severely. It vibrates in all gears. Park, drive, reverse. It vibrates so bad even my dashboard rattles. The spark plugs & engine mounts have been replaced and there is no engine light on. I took it to a mechanic and they cannot find the problem. Please help besides this issue the truck runs great.

My car has 100000 miles.
My car has an automatic transmission.

A: If a motor vibrates while in park idling, t...

If a motor vibrates while in park idling, there is either a balance issue with the motor or an engine mount problem. Locating such problems is not for the faint of heart. There are several techniques that can be done, mostly using a large pry bar to apply tension one mount at a time. When you do this with a mount and the vibration changes significantly, then you have found the mount that is the problem.

With that said, your Envoy has a few things that commonly cause this problem. The engine and transmission mounts will cause this. If the engine mounts are found to be the problem, they need to be factory parts. Many are having problems installing new aftermarket mounts that don’t fix the problem. The transmission mount get rocks stuck in it. This takes away the ability of the transmission mount to dampen vibration. This is due to the angle of the mount that makes it catch rocks from the road while you are driving.

The mounts are the most common if not main issue causing vibrations. It is possible, and I have seen such issues on other GM vehicles, for the harmonic balancer to create vibration problems. But as far as I know, I have not seen it or heard of another having vibration problems due to the harmonic balancer. The engine and transmission mounts are the main culprit on your vehicle.

I recommend the following inspection to help you out. Car is shaking and vibrating inspection

Good luck!

Was this answer helpful?

Need advice from certified mechanic? Get help now!

Over 1000 mechanics are ready to answer your question.
The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Get an instant quote for your car

Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing

Get a quote

What others are asking

Q: Gear selector stuck in park

Hello. This is a common problem in both Chevrolet and GMC trucks and SUVs of that year. The safety system requires pushing on the brake to start the vehicle, so the problem is likely that the brake switch on the...

Q: Vibration felt through seat every 5 to 10 secs at idle turning air con on stops vibration

As a car ages, things will not be the same as they were when new. There are vibrations inherent in almost every aspect of a vehicle. The fact that we feel so little when sitting in our cars is an...

Q: My 2013 GMC Terrain keeps stalling

Hello. Thanks for writing in. Replacing the camshaft position sensor was a good call, however the code is more generic and can cover some more serious issues. Since you have made this recent repair, we first want to verify that...

Related articles

P0052 OBD-II Trouble Code: HO2S Heater Control Circuit High (Bank 2 Sensor 1)
P0052 code definition HO2S Heater Control Circuit High (Bank 2 Sensor 1) What the P0052 code means This code is seen when the Engine Control Module (ECM) tries to control the...
P0240 OBD-II Trouble Code: Turbocharger Boost Sensor B Circuit Range/Performance
P0240 code definition Turbocharger Boost Sensor B Circuit Range/Performance What the P0240 code means P0240 is an OBD-II generic code triggered when the Engine Control Module (ECM) detects the intake boost...
Rules of the Road For Iowa Drivers
Driving on the roads requires knowledge of the rules, many of which are based on common sense and courtesy. However, even though you know the rules in...